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Hello. The most likely cause for this is the blower motor resistor. It varies voltage to the blower motor depending on what speed you set it to. While it is possible the blower switch to be faulty, the resistor is the most likely and most common cause. If you have, a certified technician from YourMechanic can come to your car’s location to inspect the fan circuitry to verify the problem and have this repaired properly.

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